DIY: Vacuum pump - Make

I am working on a project where I need to create a vacuum. After searching the Internet I found this really nice solution. It most likely isn't as easy as

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Diy 1l Vacuum Pump Can Use With Vacuum Wax Injector / Casting Machine Jewelry Casting Machine Jewelry Making - Jewelry Tools & Equipments - AliExpress

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Vacuum pump DIY

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DIY: Manual vacuum pump - Make